While slightly on the smaller end, a B cup size is along the C cup size one of the two most coveted bra sizes. Women with B cup boobs can consider themselves lucky, because they can choose from the widest selection of bra types, including bralettes and bandeau bras.
If you are or you think you may be a B cup size, this article is for you. We’ll also look into what B cup boobs look like, how they differ from A and C cups, as well as everything else you may want to about the B cup size.
Let’s dive in!
What Does a B Cup Size Mean?
Being a B cup size means that the difference between your bust measurement (measured at the center of your breasts where they’re the largest) and your band measurement (measured right under your boobs) is around 2 inches.
If this sounds confusing, don’t worry. We’ll explain how cup sizes are measured in more detail now.
As you probably know, bra sizes have 2 parts – a number and a letter. To get the right bra size, you need to know what both of these mean and how to measure them.
The first thing to measure is the “number” component – that is your band measurement. In essence, it tells you how many inches is your band size.
You can get this number by measuring all the way around your rib cage, right below the breasts. To find the number, you’ll need a tape measure. If you get an odd number, round up to the largest even number (for example, if your band measurement is 31 inches round it up to 32, if it’s 35 inches round it up to 36, and so on).
When measuring, you should stand straight and tall, to get the most accurate measurement. Also, measure yourself while naked.
DO NOT ADD 4 INCHES to your band measurement. There’s an outdated method that says that once you measure your band you should add 4 inches to it. While this was true many years ago, it’s mostly irrelevant now. Yet, I still hear this advice circling around on the internet. If you stumble upon it, ignore it completely.
The second thing to measure is your bust measurement. You get this number by measuring all the way around your breasts. Instead of measuring under them, you measure right across the center of your breasts, where they’re the biggest.
To reiterate, you need to measure the size of your band, that is your chest size measured right under your breasts (this is your band size, or the “number” component in the bra size). Then, you need to measure the size of your bust, that is your size at the point where your breasts are the largest.
Once you have these two numbers, the cup size is pretty easy to calculate. You just need to take the difference between your band measurement and your bust measurement. If the difference is 1 inch you’re an A cup size, if it’s 2 inches you’re a B cup size, if it’s 3 inches you’re a C cup size, and so on as shown in the following table.
To make this clearer, here’s an example. If you measured your band measurement to be 32 inches, and your bust measurement to be 34 inches, then you’re a 32B bra size (34 inches – 32 inches = 2 inches = B cup size).
If your band measurement is 32 inches, and your bust measurement is 36 inches, then you’re a 32D cup size (36 inches – 32 inches = 4 inches = D cup size).
We only calculate the “letter” part (cup size) in both of these examples. The “number” part (band size) is simply your band measurement.
While the cup size is important, for a fuller picture you must consider the band measurement as well. Two people can both have a B cup size, but they may look very different (for example, a 32B differs a lot from a 38B).
Benefits of a B Cup Size
A B cup is a larger cup size compared to A, but it’s still considered to be on the smaller side. Despite this, women of this cup size need a bra that will support their B cup boobs.
One great thing about being a B cup size is the large selection of bras. If you’re a B cup, you can choose between probably the most diverse collection of bra styles.
Having a B cup size also means that you can easily wear cute bras such as bralettes, bandeau bras, or strapless bras. With larger breasts, that’s more difficult. You’ll also be able to wear button-down shirts without worrying that your shirt will unbutton.
According to a survey of 2,000 Americans and Europeans, the B cup size is the second most desirable, following the C cup. 1 in 4 women and 1 in 5 men chose the B cup as the ideal cup size.
What Do B Cup Boobs Look Like (B Cup Breasts Examples)
While all of the above is good to know, you’re probably wondering what B cup boobs actually look like. Let’s look at a few examples of celebrities with a B cup size.
Note that there can be a lot of differences between their looks. That’s because these women may have completely different band measurements.
However, the thing that they have in common is that the difference between their bust measurement and their band measurement is around 2 inches.
A woman with a band measurement of 30 and a bust measurement of 32, and a woman with a band measurement of 38 and a bust measurement of 40 will both be a B cup size.
Even breasts that are the same size can seem different. For example, if a woman is overweight, even relatively larger breasts can seem smaller. On the other hand, the breasts of a slimmer woman may seem bigger, even when they’re the same bra size as an overweight woman’s.
A prominent example of B cup size is Australian model Miranda Kerr, who is reportedly a 32B bra size. This means that she has a band size of 32 inches, and a bust size of 34 inches.
Another famous example of a 32B cup size is American academy award winning actress Emma Stone.
Singer Rihanna is another example of a woman with B cup boobs. Compared to the other two examples, she is reportedly a 34B bra size. This puts her band size at around 34 inches, and her bust size at around 36 inches.
B Cup vs A Cup
The A cup is one cup size smaller compared to the B cup. This means that for women with the same band measurement, the bust of a woman with A cup boobs will be 1 inch (2.5 cm) smaller compared to the woman with B cup boobs.
B Cup vs C Cup
The C cup is one cup size larger compared to the B cup. This means that for women with the same band measurement, the bust of a woman with C cup boobs will be 1 inch (2.5 cm) larger compared to the woman with B cup boobs.
These two cup sizes are one of the cup sizes considered ideal by most Americans and Europeans.
B Cup vs D Cup
The D cup is two cup sizes larger compared to the B cup. This means that for women with the same band measurement, the bust of a woman with D cup boobs will be 2 inches (5 cm) larger compared to the woman with B cup boobs.
While B cup breasts are generally considered being below average, D cup breasts are on the larger side.
B Cup Size in Inches
Measured in inches, a B cup size means that your bust measurement is 2 inches larger than your band measurement. This means that if your band measurement is 32 inches, your bust measurement is 34 inches. And if your band measurement is 40 inches, your bust measurement is 42 inches.
B Cup Size in cm
Measured in centimeters, a B cup size means that your bust measurement is roughly 5 cm larger than your band measurement. This means that if your band measurement is 65 cm, your bust measurement is 70 cm. And if your band measurement is 90 cm, your bust measurement is 95 cm.
B Cup Size Chart
B cup size (UK)
Cup size measurements differ in the UK from those in the US. However, these differences are prominent when it comes to larger cup sizes.
When it comes to B cup size in the UK, it’s pretty much the same as in the US. For example, a B cup in the UK also means that the difference between the bust and the band measurement is 2 inches.
So, just like in the US, a 32B in the UK would mean that the person has a band measurement of 32 inches and a bust measurement of 34 inches.
B Cup Size Infographic
Which Bra Cup Size Is Bigger: B or C?
The C cup size is slightly bigger than a B cup size. From two women who have the same band size, the woman with a C cup size will have a bust measurement that’s 1 inch (2.5 cm) bigger than a woman with a B cup size.
What Is the Difference Between A and B Cup Size?
The difference between an A cup size and a B cup size is that the B cup size is slightly bigger. From two women who have the same band size, the woman with an A cup size will have a bust measurement that’s 1 inch (2.5 cm) smaller than a woman with a B cup size.
How Big Is a B Cup Size?
A B cup bra size has a bust measurement that’s 2 inches (5cm) bigger than its band measurement. Keep in mind that the cup size doesn’t depend on the band measurement alone. Instead, it depends on the difference between the bust size and the band size.
Are B Cups Small?
B cups are around the average bra size, but it depends on the country. In US and some European countries, B cups will be considered below average. However, in most African and Asian countries B cup boobs will be well above the average.
The B cup size is around the average bra size, although it’s on the smaller end. Still, women with B cup boobs probably won’t have back pain issues, and they have a great selection of different bra types to choose from.
Here, we discussed what a B cup size means, what B cup boobs look like, and a lot more about the B cup size.
The founder, editor, and writer of most articles on Ultimate Bra Guide. An experienced bra fitting specialist turned blogger. My website Ultimate Bra Guide has been featured in relevant publications such as Glamour, Bustle, Elite Daily, Alldaychic, Everyday Feminism, and so on. Get to know me better at our about page.